html,body,div,h1,h2,h3,h4,h5,h6,p,table,tr,td,th,ul,li,ol,dl,dt,dd,a,input,img,span,b,i{
    margin: 0;
    padding: 0;
}
html,body{
    height: 100%;
}
h1,h2,h3,h4,h5,h6{
    font-weight: normal;
}
em,i{
    font-style: normal;
}
body{
    font-family: arial,helvetica,verdana,"苹方","微软雅黑";
    font-size:12px;
    color: #5a5a5a;
}
ul{
    list-style: none;
}
img{
    border:0;
    display: block;
}
a{
    color: #333;
    border:0;
    text-decoration: none;
}
.clearfix:after{
    content: " ";
    display: block;
    height: 0;
    clear: both;
    visibility: hidden;
}
.fl{
    float: left;
}
.fr{
    float: right;
}
.bk,.bk1,.bk2,.bk5,.bk10,.bk15,.bk20,.bk25,.bk30,.bk50,.bk80,.bk100{
    height: 0;
    clear: both;
}
.bk1{
    height: 1px;
}
.bk2{
    height: 2px;
}
.bk5{
    height: 5px;
}
.bk10{
    height: 10px;
}
.bk15{
    height: 15px;
}
.bk20{
    height: 20px;
}
.bk25{
    height: 25px;
}
.bk30{
    height: 30px;
}
.bk50{
    height: 50px;
}
.bk80{
    height: 80px;
}
.bk100{
    height: 100px;
}